I have done it in some reports by dividing by 1,000,000 and showing it with one decimal only, but you're subject to cardinality issues, @rachel yaghoubzadeh.
Sure, you could examine the number and divide by 1K / 1M or not at all, adjusting the units accordingly, but it sounds like an enormous overhead for very little gains.
Maybe someone else knows more about this.
#CostingStandard(CT-Foundation)